C# super bullets hack

ok so i was working on making a super-bullets hack. i have the address(0x374B01B6), and the way to turn it on (\x90\x90\x90 -> ON) But I'm not totally sure how to finish this off.
I know that the ProcessMemoryReader.WriteProcessMemory format is
ProcessMemoryReader.WriteProcessMemory
(memaddress , Byte[] bytes to write, out int bytesWritten)

How would i put that in?

Feelin noobish!

moo9801
P.S. here's the source(this was taken from a FreeCell hack btw)